Granted you can cut a slice in any shape with a cookie cutter or knife, but for those of use without artistic abilities or SpongeBob Squarepants cookie cutters this would be slick.

Bread makers would have to come up with molds for the dough to rise/bake in, which would be about the only change from
the way things are done now. If they wanted to get fancy, they could color the bread.

in other words, you'd want the bread to look like it had been extruded. It would sort of look (for example)like a valentine heart roll of pilbury "slice and bake" cookies, but without the "background" part.